Blackened oil painting can be restored into original form by the actio

1.	Blackened oil painting can be restored into original form by the action of
Answer» Chlorine `BaO_(2)` `H_(2)O_(2)` `MnO_(2)` SOLUTION :`underset("Black")(PbS) + 4H_(2)O_(2) to underset("White")(PbSO_(4)) + 4H_(2)O`

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